I am Dr Ravinder Sharma ENT surgeon
Enlargement of tonsil
on one side and a node in neck is not a good sign. It needs to be attended fast. With the history of smoking
ther are more chances that in may be malignant (cancerous). I would advise you to stop smoking immediately and consult a ENT surgeon. You may require some tests in addition to get the correct diagnosis.
I hope this answers your concern. Feel free to contact me if you require more information about it